sometimes the drive shaft splines get rusted in the crankshaft.
patience required ! one option is to dribble some release agent down the upside down drive shaft and retry after a while.. THe oring may pose a problem if still installed so…..
removing the PH isn’t science and will give you better access to the rusted splines ..soak soak soak
when done grease the splines install o-ring
see johnson 10th edition service manual page 423 for parts diagram.
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